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The other day AVG uncovered a virus. I attempted to run MBAM, but seconds into the scan the program shut down and I could no longer access it. I ran SAS and it found a trojan that required a reboot to clean. Once the pc restarted all exe files can no longer be accessed. I can only open them with the 'run task' option within Task Manager. I am running XP. Please help.

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Welcome to Bleeping Computer. My name is m0le and I will be helping you with your log.

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* IMPORTANT !!! Save ComboFix.exe to your Desktop making sure you rename it comfix.exe

Disable your AntiVirus and AntiSpyware applications including Firewalls, usually via a right click on the System Tray icon. They may otherwise interfere with our tools. (Click onthis linkto see a list of programs that should be disabled. The list is not all inclusive.)

Double click on Comfix.exe & follow the prompts.

As part of it's process, ComboFix will check to see if the Microsoft Windows Recovery Console is installed. With malware infections being as they are today, it's strongly recommended to have this pre-installed on your machine before doing any malware removal. It will allow you to boot up into a special recovery/repair mode that will allow us to more easily help you should your computer have a problem after an attempted removal of malware.

Follow the prompts to allow ComboFix to download and install the Microsoft Windows Recovery Console, and when prompted, agree to the End-User License Agreement to install the Microsoft Windows Recovery Console.

Double-click on mbam-setup.exe to install the application or, if you are using Vista, right-click and select Run As Administrator on mbam-setup.exe to install the application.

When the installation begins, follow the prompts and do not make any changes to default settings.

When installation has finished, make sure you leave both of these checked:

Update Malwarebytes' Anti-Malware

Launch Malwarebytes' Anti-Malware

Then click Finish.

MBAM will automatically start and you will be asked to update the program before performing a scan. If an update is found, the program will automatically update itself. Press the OK button to close that box and continue.
If MBAM won't update then download and update MBAM on a clean computer then save the rules.ref folder to a memory stick. This file is found here: 'C:\Documents and Settings\All Users\Application Data\Malwarebytes\Malwarebytes' Anti-Malware' then transfer it across to the infected computer.

On the Scanner tab:

Make sure the "Perform Full Scan" option is selected.

Then click on the Scan button.

If asked to select the drives to scan, leave all the drives selected and click on the Start Scan button.

The scan will begin and "Scan in progress" will show at the top. It may take some time to complete so please be patient.

When the scan is finished, a message box will say "The scan completed successfully. Click 'Show Results' to display all objects found".

Click OK to close the message box and continue with the removal process.

Back at the main Scanner screen, click on the Show Results button to see a list of any malware that was found.

Make sure that everything is checked, and click Remove Selected.

When removal is completed, a log report will open in Notepad.

The log is automatically saved and can be viewed by clicking the Logs tab in MBAM.

Copy and paste the contents of that report in your next reply and exit MBAM.

Note: If MBAM encounters a file that is difficult to remove, you may be asked to reboot your computer so it can proceed with the disinfection process. Regardless if prompted to restart the computer or not, please do so immediately. Failure to reboot normally (not into safe mode) will prevent MBAM from removing all the malware. MBAM may make changes to your registry as part of its disinfection routine. If you're using other security programs that detect registry changes, they may alert you after scanning with MBAM. Please permit the program to allow the changes.

And

I'd like us to scan your machine with ESET OnlineScan

Hold down Control and click on the following link to open ESET OnlineScan in a new window.ESET OnlineScan